Greater Sudbury weather and climate in 2025
Day
26 °C
Night
14 °C
Sea
17 °C
Precipitation
70 mm
in month
Rainy days
10 days
in month
Daylight
15 hours
average
Sunshine
9 hours
average
Humidity
69 %
Day
26 °C
Night
14 °C
Sea
17 °C
Precipitation
70 mm
in month
Rainy days
10 days
in month
Daylight
15 hours
average
Sunshine
9 hours
average
Humidity
69 %
Overview: Greater Sudbury
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Weather overview for Greater Sudbury
Weather overview
Greater Sudbury, a city in Ontario, Canada, transcends through vastly different weathers across the seasons. The summer offers warmth with an average high of 24 °C (75 °F) in July, whereas winters can be quite harsh, as January's average low plummets to -18 °C (0 °F). The numbers of rainy days shift significantly from month to month, peaking during the autumn months. Precipitation varies, with winter's 52 mm (2.05 in) in December and 67 mm (2.64 in) in November when it tends to be more in the form of snow rather than rain. Despite the cold, the city basks in a moderate amount of sun throughout the year, reaching up to 9 hours of sunshine in July.
January weather
January in Greater Sudbury greets residents with biting cold, as the temperature can sink to a frigid average low of -18 °C (0 °F). However, daylight brings averages up to around -7 °C (20 °F). Rainy days are relatively few with the precipitation predominantly falling as snow. However, the winds can add to the chill with their speed of 5, so warm clothing is a must.
February weather
February continues the cold snap in Greater Sudbury with a slight improvement as temperatures inch up slightly to an average high of -5 °C (24 °F) and precipitation dips a bit. With an average wind speed of 4, it's wise to stay bundled up if heading outdoors. You can expect an average of 9 of snowy weather, so winter activities are still in full swing.
March weather
March in Greater Sudbury marks the transition towards spring. Though the average low temperature is still cold at -10 °C (15 °F), days start to warm up with highs reaching 1 °C (34 °F). As the snow starts to melt, you can expect 9 of precipitation and humidity levels begin to drop, indicating a shift in the season.
April weather
April ushers in the unmistakable signs of spring as Sudbury's average low rises to -1 °C (31 °F) and the highs reach more comfortable levels at 10 °C (51 °F). The number of wet days averages 9, signaling the likely continued presence of both rain and melting snow. With winds calming to an average speed of 4, outdoor activities become increasingly viable.
May weather
May in Greater Sudbury sees nature in full bloom with an average high of 18 °C (65 °F) bringing in the warmth. The nights are brisk but milder at an average low of 6 °C (43 °F). As the rainfall increases to an average of 74 mm (2.91 in), having an umbrella handy is advisable for the 10 of likely showers.
June weather
June brings the onset of summer in Greater Sudbury with average highs climbing to 24 °C (75 °F). With an increased humidity of 68 % and a reasonable 11 of precipitation, you might be reaching for lighter clothing and perhaps even a dip in the local lakes to cool off.
July weather
July is the warmest month in Greater Sudbury, boasting an average high of 26 °C (78 °F). With relatively fewer rainy days and an abundance of sunshine averaging 9 hours per day, outdoor activities and festivals are common and well-attended. Humidity lingers at 69 %, contributing to the sensation of warmth.
August weather
August maintains the summer heat in Greater Sudbury with an average high temperature of 25 °C (76 °F). The humidity, marked at 74 %, can make it feel even warmer. Expect around 11 of precipitation, which could include sporadic thunderstorms alongside warm sunny days.
September weather
September brings the beginning of fall to Greater Sudbury, with average highs decreasing to 20 °C (67 °F). Rainy days number around 11, so while summer heat lingers, the changing leaves are complemented by increasingly frequent rainy days. The winds pick up slightly with an average speed of 4.
October weather
October's crisp air in Greater Sudbury is marked by a significant drop in temperature to an average high of 12 °C (53 °F). As the colors of fall truly emerge, so does the rainfall with an average of 85 mm (3.36 in) and 12 of rainy days, hinting at the approaching winter.
November weather
November's chill is a firm reminder that winter is near in Greater Sudbury. Average highs dip to 4 °C (39 °F), and the propensity for wet days sits at 11. With precipitation transforming from rain to snow, the landscape begins to don its winter coat, and residents brace themselves for the cold to come.
December weather
December welcomes the thick of winter in Greater Sudbury. With an average high of only -3 °C (26 °F) and lows averaging -12 °C (11 °F), it is essential to keep warm. The number of wet days reach 12, with most precipitation falling as snow, covering the city in a blanket of white.
FAQs
How often does it snow in Sudbury in January?
January in Greater Sudbury has an average of 11 of precipitation, which is typically in the form of snow due to the cold temperatures.
What type of winter gear is recommended in February in Sudbury?
For February's chill in Greater Sudbury, dressing in layers with a heavy coat, insulated boots, mittens, and a hat is essential to combat the average low of -16 °C (3 °F) and persistent wind.
Does the snow typically melt in March in Sudbury?
March often marks the beginning of the melting season in Greater Sudbury with precipitation occurring on an average of 9 and slightly warmer day temperatures.
What is Sudbury's average high temperature in April?
Greater Sudbury has a pleasant average high of 10 °C (51 °F) in April, making it a welcome relief after the long winter months where temperatures begin to support outdoor spring activities.
What clothing is suitable for a day out in Sudbury during May?
May in Greater Sudbury calls for a transitional wardrobe—think layers that can be peeled off as daytime temperatures reach an amiable average high of 18 °C (65 °F).
Can you swim in Greater Sudbury during June?
With rising temperatures in June, reaching an average maximum of 24 °C (75 °F), swimming in Greater Sudbury's lakes becomes a pleasant and popular activity to beat the heat.
What should tourists pack for a July trip to Greater Sudbury?
For a trip to Greater Sudbury in July, pack lightweight clothing, sunscreen, and perhaps a light jacket for cooler evenings. The average high of 26 °C (78 °F) means most days will be pleasantly warm.
Is the humidity noticeable in August in Greater Sudbury?
Indeed, with an average humidity of 74 % in August, those in Greater Sudbury may feel the mugginess, particularly on hot days or during any heatwaves the month may have in store.
What temperatures can one expect in September in Sudbury?
In September, you can expect daytime temperatures in Greater Sudbury to average a comfortable 20 °C (67 °F), although nights gradually get cooler as the month progresses.
Is October a rainy month in Sudbury?
Definitely, October is one of the rainier months in Greater Sudbury with an average of 12 of precipitation, signifying the transition further into autumn.
When does snow typically start in Greater Sudbury?
Snow often starts making a more regular appearance in November in Greater Sudbury, as temperatures fall and the average precipitation of 67 mm (2.64 in) shifts away from rain.
How should one dress for December weather in Greater Sudbury?
Dressing for December in Greater Sudbury calls for heavy winter gear: thermal layers, insulated coats, gloves, hats, and waterproof boots to manage the biting cold and the average precipitation of 52 mm (2.05 in).
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